lib/time.in.h

   1 /* A more-standard <time.h>.
   2
   3    Copyright (C) 2007-2016 Free Software Foundation, Inc.
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 3, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  17
  18 #if __GNUC__ >= 3
  19 @PRAGMA_SYSTEM_HEADER@
  20 #endif
  21 @PRAGMA_COLUMNS@
  22
  23 /* Don't get in the way of glibc when it includes time.h merely to
  24    declare a few standard symbols, rather than to declare all the
  25    symbols.  (However, skip this for MinGW as it treats __need_time_t
  26    incompatibly.)  Also, Solaris 8 <time.h> eventually includes itself
  27    recursively; if that is happening, just include the system <time.h>
  28    without adding our own declarations.  */
  29 #if (((defined __need_time_t || defined __need_clock_t \
  30        || defined __need_timespec)                     \
  31       && !defined __MINGW32__)                         \
  32      || defined _@GUARD_PREFIX@_TIME_H)
  33
  34 # @INCLUDE_NEXT@ @NEXT_TIME_H@
  35
  36 #else
  37
  38 # define _@GUARD_PREFIX@_TIME_H
  39
  40 # @INCLUDE_NEXT@ @NEXT_TIME_H@
  41
  42 /* NetBSD 5.0 mis-defines NULL.  */
  43 # include <stddef.h>
  44
  45 /* The definitions of _GL_FUNCDECL_RPL etc. are copied here.  */
  46
  47 /* The definition of _GL_ARG_NONNULL is copied here.  */
  48
  49 /* The definition of _GL_WARN_ON_USE is copied here.  */
  50
  51 /* Some systems don't define struct timespec (e.g., AIX 4.1, Ultrix 4.3).
  52    Or they define it with the wrong member names or define it in <sys/time.h>
  53    (e.g., FreeBSD circa 1997).  Stock Mingw prior to 3.0 does not define it,
  54    but the pthreads-win32 library defines it in <pthread.h>.  */
  55 # if ! @TIME_H_DEFINES_STRUCT_TIMESPEC@
  56 #  if @SYS_TIME_H_DEFINES_STRUCT_TIMESPEC@
  57 #   include <sys/time.h>
  58 #  elif @PTHREAD_H_DEFINES_STRUCT_TIMESPEC@
  59 #   include <pthread.h>
  60 #  elif @UNISTD_H_DEFINES_STRUCT_TIMESPEC@
  61 #   include <unistd.h>
  62 #  else
  63
  64 #   ifdef __cplusplus
  65 extern "C" {
  66 #   endif
  67
  68 #   if !GNULIB_defined_struct_timespec
  69 #    undef timespec
  70 #    define timespec rpl_timespec
  71 struct timespec
  72 {
  73   time_t tv_sec;
  74   long int tv_nsec;
  75 };
  76 #    define GNULIB_defined_struct_timespec 1
  77 #   endif
  78
  79 #   ifdef __cplusplus
  80 }
  81 #   endif
  82
  83 #  endif
  84 # endif
  85
  86 # if !GNULIB_defined_struct_time_t_must_be_integral
  87 /* Per http://austingroupbugs.net/view.php?id=327, POSIX requires
  88    time_t to be an integer type, even though C99 permits floating
  89    point.  We don't know of any implementation that uses floating
  90    point, and it is much easier to write code that doesn't have to
  91    worry about that corner case, so we force the issue.  */
  92 struct __time_t_must_be_integral {
  93   unsigned int __floating_time_t_unsupported : (time_t) 1;
  94 };
  95 #  define GNULIB_defined_struct_time_t_must_be_integral 1
  96 # endif
  97
  98 /* Sleep for at least RQTP seconds unless interrupted,  If interrupted,
  99    return -1 and store the remaining time into RMTP.  See
 100    <http://www.opengroup.org/susv3xsh/nanosleep.html>.  */
 101 # if @GNULIB_NANOSLEEP@
 102 #  if @REPLACE_NANOSLEEP@
 103 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 104 #    define nanosleep rpl_nanosleep
 105 #   endif
 106 _GL_FUNCDECL_RPL (nanosleep, int,
 107                   (struct timespec const *__rqtp, struct timespec *__rmtp)
 108                   _GL_ARG_NONNULL ((1)));
 109 _GL_CXXALIAS_RPL (nanosleep, int,
 110                   (struct timespec const *__rqtp, struct timespec *__rmtp));
 111 #  else
 112 #   if ! @HAVE_NANOSLEEP@
 113 _GL_FUNCDECL_SYS (nanosleep, int,
 114                   (struct timespec const *__rqtp, struct timespec *__rmtp)
 115                   _GL_ARG_NONNULL ((1)));
 116 #   endif
 117 _GL_CXXALIAS_SYS (nanosleep, int,
 118                   (struct timespec const *__rqtp, struct timespec *__rmtp));
 119 #  endif
 120 _GL_CXXALIASWARN (nanosleep);
 121 # endif
 122
 123 /* Return the 'time_t' representation of TP and normalize TP.  */
 124 # if @GNULIB_MKTIME@
 125 #  if @REPLACE_MKTIME@
 126 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 127 #    define mktime rpl_mktime
 128 #   endif
 129 _GL_FUNCDECL_RPL (mktime, time_t, (struct tm *__tp) _GL_ARG_NONNULL ((1)));
 130 _GL_CXXALIAS_RPL (mktime, time_t, (struct tm *__tp));
 131 #  else
 132 _GL_CXXALIAS_SYS (mktime, time_t, (struct tm *__tp));
 133 #  endif
 134 _GL_CXXALIASWARN (mktime);
 135 # endif
 136
 137 /* Convert TIMER to RESULT, assuming local time and UTC respectively.  See
 138    <http://www.opengroup.org/susv3xsh/localtime_r.html> and
 139    <http://www.opengroup.org/susv3xsh/gmtime_r.html>.  */
 140 # if @GNULIB_TIME_R@
 141 #  if @REPLACE_LOCALTIME_R@
 142 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 143 #    undef localtime_r
 144 #    define localtime_r rpl_localtime_r
 145 #   endif
 146 _GL_FUNCDECL_RPL (localtime_r, struct tm *, (time_t const *restrict __timer,
 147                                              struct tm *restrict __result)
 148                                             _GL_ARG_NONNULL ((1, 2)));
 149 _GL_CXXALIAS_RPL (localtime_r, struct tm *, (time_t const *restrict __timer,
 150                                              struct tm *restrict __result));
 151 #  else
 152 #   if ! @HAVE_DECL_LOCALTIME_R@
 153 _GL_FUNCDECL_SYS (localtime_r, struct tm *, (time_t const *restrict __timer,
 154                                              struct tm *restrict __result)
 155                                             _GL_ARG_NONNULL ((1, 2)));
 156 #   endif
 157 _GL_CXXALIAS_SYS (localtime_r, struct tm *, (time_t const *restrict __timer,
 158                                              struct tm *restrict __result));
 159 #  endif
 160 #  if @HAVE_DECL_LOCALTIME_R@
 161 _GL_CXXALIASWARN (localtime_r);
 162 #  endif
 163 #  if @REPLACE_LOCALTIME_R@
 164 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 165 #    undef gmtime_r
 166 #    define gmtime_r rpl_gmtime_r
 167 #   endif
 168 _GL_FUNCDECL_RPL (gmtime_r, struct tm *, (time_t const *restrict __timer,
 169                                           struct tm *restrict __result)
 170                                          _GL_ARG_NONNULL ((1, 2)));
 171 _GL_CXXALIAS_RPL (gmtime_r, struct tm *, (time_t const *restrict __timer,
 172                                           struct tm *restrict __result));
 173 #  else
 174 #   if ! @HAVE_DECL_LOCALTIME_R@
 175 _GL_FUNCDECL_SYS (gmtime_r, struct tm *, (time_t const *restrict __timer,
 176                                           struct tm *restrict __result)
 177                                          _GL_ARG_NONNULL ((1, 2)));
 178 #   endif
 179 _GL_CXXALIAS_SYS (gmtime_r, struct tm *, (time_t const *restrict __timer,
 180                                           struct tm *restrict __result));
 181 #  endif
 182 #  if @HAVE_DECL_LOCALTIME_R@
 183 _GL_CXXALIASWARN (gmtime_r);
 184 #  endif
 185 # endif
 186
 187 /* Convert TIMER to RESULT, assuming local time and UTC respectively.  See
 188    <http://www.opengroup.org/susv3xsh/localtime.html> and
 189    <http://www.opengroup.org/susv3xsh/gmtime.html>.  */
 190 # if @GNULIB_GETTIMEOFDAY@
 191 #  if @REPLACE_LOCALTIME@
 192 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 193 #    undef localtime
 194 #    define localtime rpl_localtime
 195 #   endif
 196 _GL_FUNCDECL_RPL (localtime, struct tm *, (time_t const *__timer)
 197                                           _GL_ARG_NONNULL ((1)));
 198 _GL_CXXALIAS_RPL (localtime, struct tm *, (time_t const *__timer));
 199 #  else
 200 _GL_CXXALIAS_SYS (localtime, struct tm *, (time_t const *__timer));
 201 #  endif
 202 _GL_CXXALIASWARN (localtime);
 203 # endif
 204
 205 # if @GNULIB_GETTIMEOFDAY@
 206 #  if @REPLACE_GMTIME@
 207 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 208 #    undef gmtime
 209 #    define gmtime rpl_gmtime
 210 #   endif
 211 _GL_FUNCDECL_RPL (gmtime, struct tm *, (time_t const *__timer)
 212                                        _GL_ARG_NONNULL ((1)));
 213 _GL_CXXALIAS_RPL (gmtime, struct tm *, (time_t const *__timer));
 214 #  else
 215 _GL_CXXALIAS_SYS (gmtime, struct tm *, (time_t const *__timer));
 216 #  endif
 217 _GL_CXXALIASWARN (gmtime);
 218 # endif
 219
 220 /* Parse BUF as a time stamp, assuming FORMAT specifies its layout, and store
 221    the resulting broken-down time into TM.  See
 222    <http://www.opengroup.org/susv3xsh/strptime.html>.  */
 223 # if @GNULIB_STRPTIME@
 224 #  if ! @HAVE_STRPTIME@
 225 _GL_FUNCDECL_SYS (strptime, char *, (char const *restrict __buf,
 226                                      char const *restrict __format,
 227                                      struct tm *restrict __tm)
 228                                     _GL_ARG_NONNULL ((1, 2, 3)));
 229 #  endif
 230 _GL_CXXALIAS_SYS (strptime, char *, (char const *restrict __buf,
 231                                      char const *restrict __format,
 232                                      struct tm *restrict __tm));
 233 _GL_CXXALIASWARN (strptime);
 234 # endif
 235
 236 # if defined _GNU_SOURCE && @GNULIB_TIME_RZ@ && ! @HAVE_TIMEZONE_T@
 237 typedef struct tm_zone *timezone_t;
 238 _GL_FUNCDECL_SYS (tzalloc, timezone_t, (char const *__name));
 239 _GL_CXXALIAS_SYS (tzalloc, timezone_t, (char const *__name));
 240 _GL_FUNCDECL_SYS (tzfree, void, (timezone_t __tz));
 241 _GL_CXXALIAS_SYS (tzfree, void, (timezone_t __tz));
 242 _GL_FUNCDECL_SYS (localtime_rz, struct tm *,
 243                   (timezone_t __tz, time_t const *restrict __timer,
 244                    struct tm *restrict __result) _GL_ARG_NONNULL ((2, 3)));
 245 _GL_CXXALIAS_SYS (localtime_rz, struct tm *,
 246                   (timezone_t __tz, time_t const *restrict __timer,
 247                    struct tm *restrict __result));
 248 _GL_FUNCDECL_SYS (mktime_z, time_t,
 249                   (timezone_t __tz, struct tm *restrict __result)
 250                   _GL_ARG_NONNULL ((2)));
 251 _GL_CXXALIAS_SYS (mktime_z, time_t,
 252                   (timezone_t __tz, struct tm *restrict __result));
 253 # endif
 254
 255 /* Convert TM to a time_t value, assuming UTC.  */
 256 # if @GNULIB_TIMEGM@
 257 #  if @REPLACE_TIMEGM@
 258 #   if !(defined __cplusplus && defined GNULIB_NAMESPACE)
 259 #    undef timegm
 260 #    define timegm rpl_timegm
 261 #   endif
 262 _GL_FUNCDECL_RPL (timegm, time_t, (struct tm *__tm) _GL_ARG_NONNULL ((1)));
 263 _GL_CXXALIAS_RPL (timegm, time_t, (struct tm *__tm));
 264 #  else
 265 #   if ! @HAVE_TIMEGM@
 266 _GL_FUNCDECL_SYS (timegm, time_t, (struct tm *__tm) _GL_ARG_NONNULL ((1)));
 267 #   endif
 268 _GL_CXXALIAS_SYS (timegm, time_t, (struct tm *__tm));
 269 #  endif
 270 _GL_CXXALIASWARN (timegm);
 271 # endif
 272
 273 /* Encourage applications to avoid unsafe functions that can overrun
 274    buffers when given outlandish struct tm values.  Portable
 275    applications should use strftime (or even sprintf) instead.  */
 276 # if defined GNULIB_POSIXCHECK
 277 #  undef asctime
 278 _GL_WARN_ON_USE (asctime, "asctime can overrun buffers in some cases - "
 279                  "better use strftime (or even sprintf) instead");
 280 # endif
 281 # if defined GNULIB_POSIXCHECK
 282 #  undef asctime_r
 283 _GL_WARN_ON_USE (asctime, "asctime_r can overrun buffers in some cases - "
 284                  "better use strftime (or even sprintf) instead");
 285 # endif
 286 # if defined GNULIB_POSIXCHECK
 287 #  undef ctime
 288 _GL_WARN_ON_USE (asctime, "ctime can overrun buffers in some cases - "
 289                  "better use strftime (or even sprintf) instead");
 290 # endif
 291 # if defined GNULIB_POSIXCHECK
 292 #  undef ctime_r
 293 _GL_WARN_ON_USE (asctime, "ctime_r can overrun buffers in some cases - "
 294                  "better use strftime (or even sprintf) instead");
 295 # endif
 296
 297 #endif